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Long-Term Debt - Summary of Long Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Oct. 23, 2024
Jun. 27, 2024
Mar. 09, 2024
Mar. 07, 2024
Jan. 20, 2022
Aug. 05, 2020
Oct. 11, 2019
Summary of Long-term debt                  
MRL Term Loan Credit Agreement $ 73.7 $ 74.4              
MRL asset financing arrangements 368.1 384.6              
Finance lease obligations, at various interest rates, interest and principal payments monthly through June 2028 2.9 [1] 3.0              
Less unamortized debt issuance costs (14.4) (16.1)              
Less unamortized discounts (2.3) (3.5)              
Total debt 2,100.2 1,885.4              
Less current portion of long-term debt 35.5 55.7              
Total long-term debt 2,064.7 1,829.7              
Accumulated amortization, deferred debt issuance costs $ 31.6 $ 26.6              
Maximum                  
Summary of Long-term debt                  
Borrowings under senior notes         $ 200.0        
Revolving Credit Facility                  
Summary of Long-term debt                  
Weighted average interest rate during period 7.50% 7.40%              
Long-term line of credit $ 286.6 $ 136.7              
MRL Revolving Credit Agreement                  
Summary of Long-term debt                  
Weighted average interest rate during period 7.30% 11.20%              
Borrowings under senior notes $ 0.0 $ 13.0              
9.25% Senior Notes due July 2024                  
Summary of Long-term debt                  
Fixed interest rate   9.25%           9.25%  
Effective interest rate   9.50%              
Borrowings under senior notes $ 0.0 $ 179.0              
Total long-term debt   $ 149.0              
11.0% Senior Notes due April 2025                  
Summary of Long-term debt                  
Fixed interest rate 11.00% 11.00%       11.00%     11.00%
Effective interest rate 11.40% 11.40%              
Borrowings under senior notes $ 0.0 $ 413.5              
11.0% Senior Notes due July 2027                  
Summary of Long-term debt                  
Fixed interest rate 11.00% 11.00% 11.00%            
Effective interest rate 11.10% 11.10%              
Borrowings under senior notes $ 354.4 $ 0.0              
8.125% Senior Notes due July 2027                  
Summary of Long-term debt                  
Fixed interest rate 8.125% 8.125%         8.125%    
Effective interest rate 8.30% 8.30%              
Borrowings under senior notes $ 325.0 $ 325.0              
9.75% July 2028, Notes                  
Summary of Long-term debt                  
Fixed interest rate 9.75% 9.75%   9.75%          
Effective interest rate 10.20% 10.00%              
Borrowings under senior notes $ 325.0 $ 325.0              
9.25% July 2029, Notes                  
Summary of Long-term debt                  
Fixed interest rate 9.25%                
Effective interest rate 9.40%                
Borrowings under senior notes $ 200.0 0.0              
9.25% Senior Secured First Lien Notes due 2029 (the "2029 Secured Notes")                  
Summary of Long-term debt                  
Fixed interest rate           9.25%      
Shreveport terminal asset financing arrangement                  
Summary of Long-term debt                  
Asset financing arrangement 42.1 50.8              
Montana terminal asset financing arrangement                  
Summary of Long-term debt                  
Asset financing arrangement 30.4 0.0              
Montana refinery asset financing arrangement                  
Summary of Long-term debt                  
Asset financing arrangement $ 108.7 $ 0.0              
[1] As of December 31, 2024, the Company’s finance lease payments included no material options to extend lease terms that are reasonably certain of being exercised. In addition, the Company has no legally binding minimum lease payments for leases that have been signed but not yet commenced as of December 31, 2024.